maryland's most powerful radar that should continue to be the case tonight, tomorrow and probably into at least thursday afternoon. i think thursday afternoon, friday afternoon will feature thunderstorms. 91 in winchester, virginia. heat advisories kick in tomorrow at noon has temperatures should make the mid to upper 90s. heat index values over 100. you see the philadelphia area with an excessive heat warning. i got a feeling this will be a broken record all corm -- summer. unhealthy air, especially for sensitive groups. as we take a look at the relative humidities, mid-30s, 51 in cambridge. this mugginess is beginning to increase but it's not to the level this will be the next few days. there were a few storms west of us, garrett county into west virginia. we're done with that complex. tropical air continuing to build. big ridge of high pressure, a very summer-like pattern that will build in at least through the end of the week. i got tell you some indications that cold front will not make this down for a few days. so muggier and hotter tomorrow, maybe another round of showers or sto